I'd like to start my own business—that's I'd do if I had the money.(2011·江西)
A. why
B. when
C. which
D. what
网友回答
A. why
B. when
C. which
(答案→)D. what
解析：句意：我想自己做生意——那是我如果有钱就会做的事情。从句中的do是及物动词，缺少宾语，所以将A和B排除，这两个选项在从句中常常作状语。which引导名词性从句时，意为“哪个，哪些”，不合逻辑，故用what。